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Biden pledges mpox aid to Africa in his valedictory speech to the United Nations

President Biden talked about the sweeping changes he has seen during his long career, urged an end to wars in Ukraine, Gaza and Sudan, and said "some things are more important than staying in power."

Project RattleCam lets people observe rattlesnakes with a live webcam.

Watch a livestream of Colorado's 'mega den' of pregnant rattlesnakes

On a rocky hillside in Colorado is a "mega den" of hundreds of rattlesnakes — along with cameras livestreaming the whole thing.

Science experiments and endless enthusiasm led a physics professor to TikTok stardom

Videos of Tatiana Erukhimova's enthusiastic teaching style have gone viral on social media. The secret to her success? It didn't happen overnight.

From fruit fly to this guy: a map of one tiny brain may show how larger ones work

The first full map of an adult fruit fly's brain shows 50 million connections between neurons. Researchers are using the map to learn how all brains work.

California lawmakers are considering a bill that would require tortillas and other foods made with corn masa flour to include the ingredient folic acid. The vitamin reduces the likelihood of birth defects. Here, tortilla packages are stacked at a supermarket in Fresno on April 9, 2024.

Why tortillas sold in California may be forced to add a new ingredient

Folic acid reduces the risk of birth defects and the FDA requires that bakers include it in enriched bread. California could extend the mandate to tortillas and foods made with corn masa flour.

Pat Haskins, a 72-year-old retired school teacher, poses for a portrait in the backyard of her home in Silver Spring, Md., on Oct. 22. She had struggled to keep up with repairs as her basement flooded, a bathroom floor sagged and her disabled partner needed a ramp.

Millions of low-cost homes are deteriorating, making the U.S. housing shortage worse

Older homes are the only ones many Americans can afford, but they are costly to fix and maintain, especially for seniors. A patchwork of programs to help are underfunded and have years-long waitlists.

In this long-exposure photo provided by NASA, Boeing's Starliner spacecraft is docked to the Harmony module of the International Space Station on July 3.

An empty Boeing Starliner is set to return next week, while its crew stays in space

An empty Boeing Starliner is scheduled to return from the International Space Station in early September. It will fly home autonomously while its crew remains in space until February.

Marie Guenther votes at the Bay View Library with her son in October 2020 in Milwaukee, Wisc., considered a battleground state.

How swing states came to be critical in U.S. presidential elections

Political campaigns and pundits have long focused on swing states because they offer candidates an opportunity to sway voters off the fence and win coveted Electoral College votes.

A squat lobster in the genus Sternostylus, thought to be a newly identified species, was photographed along the Nazca Ridge off the coast of Chile.

A newly mapped underwater mountain could be home to 20 new species

Researchers who led the 28-day expedition along the nearly 2-mile tall seamount hope the discoveries made will inform future policies safeguarding the understudied, high-seas region.

In battleground states, it's not just about winning — but also losing by less

In a state where every vote matters, both Democratic and Republican campaigns are not only trying to win in counties where they're strongest, they're also trying to lose by less.

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